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Sure VFD or at least bypass pressure differential. VFD will decrease flow trough system and boiler without separation when load will drop. Differential pressure by pass will keep same max flow trough the boiler even system flow might be very low, if there is no separation when load will drop...

Are you even reading my posts?

Maybe now is the time to read this book?

So, if you using TRVs, do you use p/s or you still using direct pumping ? Also buderus , Weil McLain and slant fin are great brand names and I feel good you some how place me in that group in regards of single minded average plumber I am. So still do you use TRVs with direct pumped boiler ?

Find qualified installer with good track record and references, and he will guide you trough whole process. Just place price issue at #5 in your priorities list in this project.

Quote Originally Posted by BadgerBoilerMN QUOTE: Viessmann does not mandate P/S and one of the reasons they are one of our favorites on steam and gravity conversions. They do like to sell hydrolic separators, something trade magazines and those who write for them are sensitive to. There...

Usually $20k+ only boiler with indirect. Steam to hot water with mod con boiler and indirect for 20K is below the cost in my opinion.

where in my post "these are clear guidelines for LLH also make a note that in viessmann opinion primary secondary arrangement does promote condensing in condensing boilers, quite different from your statement." you see words viessmann mandates? Also see all benefits listed. Why not do it...

It costs much more than $20.000 to do steam to hot water conversion properly

This is not true. load is determined by space heat loss, not temperature of radiator. Also, delivering higher temperature water to radiator or manifold, allows to cut on flow, because heat load is dictated by heat loss, and using universal formula Q=dTxFlow(GPM) x500, where Q is amount of heat...

these are clear guidelines for LLH also make a note that in viessmann opinion primary secondary arrangement does promote condensing in condensing boilers, quite different from your statement.

Well insulated steam pipes losing as little heat as well insulated hot water piping. It does not matter what diameter piping there, it matters how well piping insulation done in unconditioned spaces. And we do it well. Heat losses of uninsulated brownstones are high, but does heat loss depends...

Maybe you need this book signed by Dan Hologan I attached photo of afterword page. Interesting reading, isn't it? BTW, last time I saw Dan, he thanked me for contribution to his site. And this page is from viessman vitodens boiler installation manual. This boiler is so new, it will...

Why you discriminating against elderly people and cats? They can be burnt by hot radiator too. And what about a cup of tea? What if children are around cup of tea of 200F. They can get burnt too. Steam is around for a quite a few years and i still have to hear about children burnt by hot...

Btu is btu. What gets lost trough envelope of building gets replenished by radiator output. When balance loss/gain is reached temperature in the room gets stable. Your reference to lower radiator temperature on forced hot water system probably is outdoor reset, on steam I use indoor reset. High...

In injection loops for radiant heat you might find 70F delta t with delivery temperature of water 180F. It is done to reduce GPM , pumping costs and installation costs. In hydronic applications the larger delta T supply return ( non radiant ) desired, to reduce pumping costs, installation costs...

You do a lot of forced hot water systems and do not utilize primary secondary piping? That is strange. How you decouple boiler from the heating system? In my steam systems people set the temperature in each room independently. And over sizing of the radiators are things of the past. System...

Why would you add cold water constantly to steam system? High pressure, low pressure boilers, What it has to do with efficiency? What you do is burn fuel, generate heat and transfer it to where it is needed. How you do it and what you lose in the process depends on system design, not a media...

Steam I had a chance to install steam boiler with modifications of steam heating system and condensing boiler on 2 identical brownstones within couple blocks from each other. The gas bills were within 20 dollars difference on winter month. Taking into account electrical charges to drive 2...

Steam system done 100 years ago is much better quality than anything you will get today. people knew how to do quality job 100 years ago. as per efficiency, install properly sized steam gas boiler, line chimney, install TRVs on radiator, insulate existing piping and you will have all you need...